Finding the Third Proportional to 286.31 and 443.25

Step by Step Solution

1. Step 1: Write the proportion equation
   286.31 : 443.25 = 443.25 : x
2. Step 2: Convert to fraction form
   286.31/443.25 = 443.25/x
3. Step 3: Cross multiply
   286.31x = 443.25 × 443.25
4. Step 4: Simplify right side
   286.31x = 196,470.56
5. Step 5: Solve for x
   x = 196,470.56/286.31
6. Step 6: Final answer
   x = 686.21